A bulletin board is an online discussion site. It's sometimes also called a 'board' or 'forums'. It may contain several categories, consisting of forums, threads and individual posts.
In most nightclub environments, dark wool, cotton or synthetic slacks mate well with a button up shirt. Gentlemen in nightclubs should use caution to distinguish between button-up shirts appropriate for nightclub wear and the dressier, somewhat stodgier button-up shirts intended for professional office wear.
Forbidden footwear for clubs are sneakers, sports sandals, and flip-flops. Don't assume all clubs have the same dress code. Just because one club allowed you in wearing a t-shirt doesn't mean that the next one will, and arguing won't help.